Chiari [Kee-AR-ee]:is a malformation (most generally genetic) of the back of the cerebellum. Chiari is thought to be caused by a small posterior fossa (depression on the inside of the back of the skull near the base, where the cerebellum is normally situated). The crowded cerebellum pushes against the brainstem and/or the foramen magnum blocking off CSF (Cerebrospinal fluid) to the brain and/or spinal canal, causing all sorts of neurological problems. The symptoms list is quite lengthy, but the most common symptom is pounding, sub-occipital headache, which as some of the other symptoms, it doesn't respond to any normally successful therapies. . Chiari is also associated with other disease processes or conditions including: Syringomyelia,Scoliosis, Tethered Spinal Cord, Ehlers-Danlos Syndrome, Fibromyalgia, and Pseudo-Tumor Cerebri, etc.

Chiari has so many symptoms that if it isn't tested the right way, it could be mistaken for another disease. These diseases can also be caused by Chiari. Here is a list of some of those diseases:

Migraine

Cluster Headache

Rebound Headache

Pseudotumor Cerebri

Occipital Neuralgia

Post-Concussion Syndrome

Hydrocephalus

Multiple Sclerosis

Chronic Fatigue Syndrome

Fibromyalgia

Sleep Apnea

Spinal Fluid Leak

Arachnoid Cyst

Degenerative Disc Disease

Psychiatric Disease